【单选题】1,某企业全年需要甲材料240吨,每次进货成本为40元,每吨材料储存成本为12元,则全年最佳进货次数为(
【简答题】Q组合应该放在该区段中所有道岔的岔尖______侧。
【单选题】What is special about the rock climbing competition?
A.
A foreign team takes part in it.
B.
You don't have to pay to watch it.
C.
You don't have to be a sportsman to take part.
D.
The bus trip to the place of the competition is free.
【单选题】he said ,“don’t do that again.”
A.
_____me____that again.
【单选题】用以下几类工作填筑材料时基本工程性质由好到差的正确排列是( )
【单选题】What is special about the rock climbing competition?
A.
A foreign team takes part in it.
B.
You don't have to pay to watch it.
C.
You don't have to be a sportsman to take part in.
D.
The bus trip to the place of the competition is free.
【简答题】求等差数列数列的2,5,8,...的第20项
【多选题】In addition to C-S-H gel, hardened cement contains ( ).
【单选题】What is special about the rock climbing competition?
A.
A foreign team takes part in it.
B.
You can watch it without paying.
C.
You don't have to be a sportsman to take part.
D.
The bus trip to the place of the competition is free.
【简答题】求等差数列 8,5,2 , ... 的通项公式和第 20 项.